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29-559: The word Rieselfeld means leach field in German and refers to how the area started. To ensure wastewater disposal for the city, which had grown to a population number of over 50,000 inhabitants, Freiburg acquired an area spanning 500 hectares from the University of Freiburg in 1891. After Nazism had ended, Sinti , among them some who had survived the Holocaust , settled in the area of Haid,

58-413: A Catholic and Lutheran Church which are both named after Mary Magdalene. The two Churches are separated by a large foyer with a side wall which can be moved to make a large joint room out of the two sacred spaces. The demographic of Rieselfeld is characterised by two striking factors: With regards to the second point, three schools - a primary school, a secondary school (which was relocated there from

87-405: A percolation test ("perc" test) to establish the suitability of drain field soil to receive septic tank effluent. An engineer , soil scientist , or licensed designer may be required to work with the local governing agency to design a system that conforms to these criteria. A more progressive way to determine leach field sizing is by direct observation of the soil profile. In this observation,

116-470: A community of anaerobic organisms capable of liquefying anticipated amounts of putrescible materials in wastewater, a drain field should be sized to support a community of aerobic soil microorganisms capable of decomposing the anaerobic septic tank's effluent into aerobic water. Hydrogen sulfide odors or iron bacteria may be observed in nearby wells or surface waters when effluent has not been completely oxidized before reaching those areas. The biofilm on

145-408: A district adjacent to today's Rieselfeld. The Opfinger Siedlung, home of alleged outlaws and criminals, was also very close by. Living in these areas, which were not yet situated in the city, meant societal exclusion for the inhabitants. In 1985, the sewage plant had to be shut down due to insufficient capacity to deal with wastewater. The amount of wastewater had increased to 90,00 m³ per day and

174-463: A park was added, as well as a church and a community centre. In July 2006, work to expand the Kepler Gymnasium began. Since the site was owned by the city funding for planning and development costs was raised through the sale of the site itself. The initial costs currently amount to 145 million euros, of which 85 million were offset by the sale of the site. The Rieselfeld Project was coordinated by

203-452: A septic tank, and associated piping compose a septic system . The drain field typically consists of an arrangement of trenches containing perforated pipes and porous material (often gravel ) covered by a layer of soil to prevent animals (and surface runoff ) from reaching the wastewater distributed within those trenches. Primary design considerations are both hydraulic for the volume of wastewater requiring disposal and catabolic for

232-450: Is also a sports field north of Mundenhofer Straße . The second park is located in the southwest of the district. It is a wetland biotope that is watered only with rainwater from the surrounding rooftops. Wild carrot (Queen Anne's lace) is the host plant for the caterpillars of the Old World swallowtail and grows at the border of the park. The nature reserve Freiburger Rieselfeld borders

261-533: Is also served by several bus lines. A small park was built right next to the secondary school Kepler-Gymnasium in the north of Rieselfeld, including a lawn for sunbathing and a playground for children. The primary school Clara-Grundwald-Grundschule is opposite the Kepler-Gymnasium . The green roof of the primary school's gym is accessible and connects the park with the Maria-von-Rudloff-Patz . There

290-402: Is unlikely to match, the original clean water percolation rate of the site. Septic tank and drain field microorganisms have very limited capability for catabolizing petroleum products and chlorinated solvents , and cannot remove dissolved metals ; however, some may be absorbed into septic tank sludge or drain field soils, and concentrations may be diluted by other groundwater in the vicinity of

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348-640: The apartments in Rieselfeld are arranged in rows of houses along the street with green spaces and gardens in between and in back. Urban style buildings, with no space in between, were, however, built along the Rieselfeldallee which functioned as a principal axis for the area and accommodated the tram line. In order to ensure a heterogenous social structure, rental and owner-occupied apartments as well as single family homes and blocks of flats were not separated from each other. With regards to environmental sustainability

377-429: The building department, specifically the newly founded group called “Projektgruppe Rieselfeld”. The development of the site was undertaken by commercial building contractors as well as private property developers, that is to say a collaborative association. In order to prevent an area of homogenous buildings, each investor was only allowed to build 40 housing units in one area, which equals three building plots. Almost all

406-417: The chances of the drain field plugging up. The biofilter will not reduce the volume of liquid that must percolate into the soil, but it may reduce the oxygen demand of organic materials in that liquid. A drain field may be designed to offer several separate disposal areas for effluent from a single septic tank. One area may be "rested" while effluent is routed to a different area. The nematode community in

435-503: The city centre) and the third Waldorf School in Freiburg - as well as several nurseries have been built. Among other things, the district was designed to enable residents to find a job in Rieselfeld or in the immediate vicinity (e.g. the industrial area Haid ). After construction in the district was completed in 2013, around 1,000 new jobs in kindergartens, schools, restaurants and doctor's surgeries have since been created. All streets in

464-437: The disposal could not be handled without preparing the soil of the area beforehand, which caused additional legal problems. The Rieselfeld district was established in 1992 when a competition to design city districts was initiated. The group "Süd-West" from Lörrach won the competition together with the architectural firm Böwer Eith Murken Spiecker, the architect Manfred Morlock and the landscaper Bernd Meier. The overall management

493-481: The district have a speed limit of 30 kmh (approximately 18,6 mph) in order to keep individual traffic low and make the district quiet and family-friendly. The tram line 5, leading through the main street of the district, has connected Rieselfeld with the city centre since 1997 and enables people to reach it within 15 to 20 minutes by getting on the tram at one of the three stops Maria-von-Rudloff-PLatz , Geschwister-Scholl-Platz and Bollerstaudenstraße . Rieselfeld

522-447: The district to the west and functions as a local recreation area for its residents. Leach field Septic drain fields , also called leach fields or leach drains , are subsurface wastewater disposal facilities used to remove contaminants and impurities from the liquid that emerges after anaerobic digestion in a septic tank . Organic materials in the liquid are catabolized by a microbial ecosystem . A septic drain field,

551-399: The drain field before pathogens are destroyed. Silt and clay effectively filter out pathogens but limit wastewater flow rates. Percolation tests measure the rate at which clean water disperses through a disposal trench into the soil. Several factors may reduce observed percolation rates when the drain field receives anoxic septic tank effluent: Just as a septic tank is sized to support

580-402: The drain field. Cleaning formulations may reduce drain field efficiency. Laundry bleach may slow or stop microbial activity in the drain field, and sanitizing or deodorizing chemicals may have similar effects. Detergents, solvents, and drain cleaners may transport emulsified , saponified or dissolved fats into the drain field before they can be catabolized into short-chain organic acids in

609-479: The engineer evaluates many features of the soil such as texture, structure, consistency, pores/roots, etc. The goal of percolation testing is to ensure the soil is permeable enough for septic tank effluent to percolate away from the drain field but fine-grained enough to filter out pathogenic bacteria and viruses before they travel far enough to reach a water well or surface water supply. Coarse soils – sand and gravel – can transmit wastewater away from

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638-461: The entire development is constructed to be energy saving, mostly using renewable power sources. In addition, the district is both entirely wheelchair and buggy friendly. The Maria-Magdalena Church is a compact concrete building designed by Susanne Gross, an architect from Cologne . The fact that it is a church is not immediately obvious, especially as it is missing a tower. It is located in the centre of Rieselfeld and is, somewhat unusually, home to both

667-471: The long-term biochemical oxygen demand of that wastewater. The land area that is set aside for the septic drain field may be called a septic reserve area (SRA). Sewage farms similarly dispose of wastewater through a series of ditches and lagoons (often with little or no pre-treatment). These are more often found in arid countries as the waterflow on the surface allows for irrigation (and fertilization) of agricultural land. Many health departments require

696-605: The mixing of soluble organic compounds into the groundwater and the transport of oxygen from underlying groundwater or the capillary fringe of the groundwater surface to micro-organisms capable of catabolizing dissolved organic compounds remaining in the effluent plume. When a septic tank is used in combination with a biofilter , the height and catabolic area of the drain field may be reduced. Biofilter technology may allow higher-density residential construction, minimal site disturbance, and more usable land for trees, swimming pools, or gardens. Adequate routine maintenance may reduce

725-406: The resting drain field continues feeding on the accumulated biofilm and fats when the anaerobic septic tank effluent is no longer available. This natural cleansing process may reduce bioclogging to improve the hydraulic capacity of the field by increasing the available interstitial area of the soil as the accumulated organic material is oxidized. The percolation rate after resting may approach, but

754-1014: The septic tank scum layer. Haid (Freiburg im Breisgau) Look for Haid (Freiburg im Breisgau) on one of Misplaced Pages's sister projects : [REDACTED] Wiktionary (dictionary) [REDACTED] Wikibooks (textbooks) [REDACTED] Wikiquote (quotations) [REDACTED] Wikisource (library) [REDACTED] Wikiversity (learning resources) [REDACTED] Commons (media) [REDACTED] Wikivoyage (travel guide) [REDACTED] Wikinews (news source) [REDACTED] Wikidata (linked database) [REDACTED] Wikispecies (species directory) Misplaced Pages does not have an article with this exact name. Please search for Haid (Freiburg im Breisgau) in Misplaced Pages to check for alternative titles or spellings. You need to log in or create an account and be autoconfirmed to create new articles. Alternatively, you can use

783-402: The walls of the drain field trenches will use atmospheric oxygen in the trenches to catabolize organic compounds in septic tank effluent. Groundwater flow is laminar in the aquifer soils surrounding the drain field. Septic tank effluent with soluble organic compounds passing through the biofilm forms a mounded lens atop the groundwater underlying the drain field. Molecular diffusion controls

812-480: Was assigned to Hans Rudolf Güdemann. After several soil analyses and the subsequent soil stripping, all requirements were fulfilled to build on the former wastewater disposal area. In 1993, work started in the first segment. In 1994, the first apartments were being built and only two years later, the first apartments were finished and given over to the new inhabitants. The next year, the Clara-Grunwald primary school

841-496: Was opened and the Kepler Gymnasium, which already existed at this point, was moved into the newly built complex. Additionally, the Sepp-Glaser gym was dedicated and the initial work for the second and third segments of project “Rieselfeld” were started. To ensure public transportation to Freiburg's city centre, tram line 5 was also installed in 1997. In 2000, work for the fourth and last segment of “Rieselfeld” started. One year later,

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